Impeovement ts  goveenoes poe steam engikes



@with tatzsstmt @fitta IMPROVEMENT GOVERNORS FOR STEAM EhTGINES.V

r' FRANCIS TAGGART, BROOKLYN, NEW YORK. Lesers Para No, 60,084, ma November 27, 1866.

p SIEEQIFIQATION. TO ALL WHOM IT MAY CONOERN: i

Be it known that I, FnANcIs TAGGABT; of Brooklyn, in the county of` Kings, and State of NewiYork,`h`ave invented and made acertain new and useful Improvement in Regulators for Engines; and I do hereby declare the following to be a full, clear, and exact description of my said invention, reference being hadto the annexed drawing, making part of this speciiicationywheren,

Figure` 1 is a vertical section of the said improved regulator; and Figure 2 is an elevation of the lsame showing the counterweights. Similar marks of reference denote the same parts. Governors and regulators for engines have heretofore `been made in which the velocityof the engine has been employed as the regulator of the speed; the object of my invention is to produce a regulation of the supply i of steam `from the relative pressure in the cylinder and boiler so that a di'erence in the pressure shall produce motion tov act pn the cut-oil` and open the same` as the pressures approach equality, and close the valve as the i pressures increase in diference. `By these 'means I am enabled to elfect a more perfect regulation of the speed s than" with governors that depend upon velocity, rbecause in such governors, to make them eicient; they have to be adjusted by hand in case of unusual'increase or decrease of -pressure in the boiler. l In the drawing, a represents the steam pipe passing to. the boiler, 6 the steam pipepassing to the engine cylinder; c is a pipeler casing of suitable size and shape connecting the pipes a` and b, and forming the steam way; d and e are cylinders tted into the casing, c, and provided with pistons, f and Q,that are ground to iit steam-tight, but to move freely endwise in therrespective cylinders; and these cylinders are formed with slots or steam-ways ath and z'. The pistons, and y, are connected to each other by the rodk, from which a iiat linked chain or equivalent device is` passed around and connected with the shaft, Z. 'O`n this shaft, Z, is a cam or scroll, o, around which passes a belt or dat chain, one end being connected at the smaller portion of the said scroll, the other passing to a weight, m. n is a belt, one `end of which is attached to the hub of the cam, o; the other passes over a roller, p, and carries a weight, g. i

The operation is as follows: The parts are so adjusted that the weights, m and q, will balance when the pistons, f and g, are in'a given position, leaving a certain portion of the slots, h, open sufficient to supply usteam to the cylinder of the engine when running with the average pressure in the boiler. If the speed increases, the pressure in the pipe, b, will lessen, and the pistons, f, will move upwards, clo'silgoff a portion of the slots, h, and shuttingthe supply of `steam partly off;4 and the partial rotation of the shaft, l, will bring the parts to a balance, because the scroll, o', turning up, the weight, m, will have Vgreater leverage; and hence more power in 'preventing the said shaft turning too far. I f the pressure in the cylinder of the engine increases in consequence of moving more slowly, the "pistons, f and g, will move downwards by the increased pressure on the piston f, opening the steam-supply slots, h, wider, and hence giving more'steam to the engine, and the partsagain come to a balance andremain stationary, because the scroll, o, descending from-under the bandfof theweight, 'nuthat has less power in consequence of `the lessened leverage, and the weight, q, `prevents afurther rotation Vof the i shaft, Z. `llrom the shaft, l, there may be a connection to any desired character offthrottle-valvei; arid it will be apparent that this apparatusmay itself regulate the steam as it passes through it .to the cylinder, or be the motive power `for actuating a throttle-valve in the steam pipe, according'to the relative pressures in the cylinder and in the boiler, so as to increase the supply of steam with the increase of pressure, and decrease the supply of steam with the` decreaseof pressure. I t will be evident that the pistons, f and g, might b e connected with a straight rod and controlledby weights and levers or springs, so that a preponderance of relative pressure on the pistons f or g shall cause an endwise movementfo opening or closing the steam passage to the engine. l p If the piston gis used alone, with a connection to a throttle-valve, in place of using the piston f, the pressure of steam in the boiler will be made to open or close the steam-way to the engine; but vwhere both pistons, f and g, are used, the pressure in theengie also comes in as one of the elements in the regulation bythe apparatus.

What I claim, and desire to secure by Letters Patent, is i i A regulator lfor engines,- tted substantially in the manner specified, so that the pressure from the boiler shall act inthe oppositevdirection to the pressure from the engine, and the difference of pressureV produce a movementl to regulate the supply of steam, substantially asset forth. k In witness whereof I have'hereunto set my'signature this nineteenth day of July, A. D. 1866.

FRANCIS meenam( Witnesses:

Guo. D. WALKER, LEM-Uni. W. SERRELL. 

